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Preparation method of cathode paste for lithium ion battery

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of personnel input, time input requirements, and time-consuming, shortening the stirring process time and reducing the number of operating procedures. , the effect of high capacity retention

Active Publication Date: 2018-11-30
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the application number CN201711095904.7 discloses a wet homogenization process for positive electrodes of lithium-ion batteries, which uses polyvinylidene fluoride (PVDF) as a binder, and N_methylpyrrolidone (NMP) As a dispersant, at the same time, appropriate addition of surfactant improves the uniformity and dispersion stability of the battery slurry, but this solution still takes a long time, and the addition process has a lot of dust on the operator's body The health status has a great impact, and as the amount of cutting material increases, the problem of demanding personnel investment and time investment

Method used

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  • Preparation method of cathode paste for lithium ion battery
  • Preparation method of cathode paste for lithium ion battery
  • Preparation method of cathode paste for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersion turntable diameter 50mm)

[0031] The first step: add all the dry powder (LPF, SP, PVDF) in order, forward revolution 50rpm / dispersion 2.7m / s; stir for 30-60min;

[0032] Step 2: Add appropriate amount of NMP to wet the powder particles, make the surface of the particles adsorb the solvent, make the solid content 70%, reverse revolution 60rpm / dispersion 3.9m / s; stirring 30-60min, the stirring process every 15min Monitor the appearance of the slurry, if there is a state of loose sand, stop stirring in time and move to the next step;

[0033] The third step: continue to add NMP so that the solid content is 60%, the forward revolution is 80rpm / dispersion 6.5m / s; the stirring is 60-90min; after the stirring is completed, the mass slurry attached to the stirring blade is scraped off;

[0034] The fourth step: continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process,...

Embodiment 2

[0037] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersion turntable diameter 50mm)

[0038] The first step: add all the dry powder (LPF, SP, PVDF) in order, forward revolution 50rpm / dispersion 2.7m / s; stir for 30-60min;

[0039] Step 2: Add appropriate amount of NMP to wet the powder particles, make the surface of the particles adsorb the solvent, make the solid content 73%, reverse revolution 60rpm / dispersion 3.9m / s; stirring 30-60min, the stirring process every 15min Monitor the appearance of the slurry, if there is a state of loose sand, stop stirring in time and move to the next step;

[0040] The third step: continue to add NMP so that the solid content is 60%, the forward revolution is 80rpm / dispersion 6.5m / s; the stirring is 60-90min; after the stirring is completed, the mass slurry attached to the stirring blade is scraped off;

[0041] The fourth step: continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process,...

Embodiment 3

[0045] Take LPF / PVDF / SP / NMP system pulping as an example (5L mixer / dispersion turntable diameter 50mm)

[0046] The first step: add all the dry powder (LPF, SP, PVDF) in order, forward revolution 50rpm / dispersion 2.7m / s; stir for 30-60min;

[0047] Step 2: Add appropriate amount of NMP to wet the powder particles, make the surface of the particles adsorb the solvent, make the solid content 75%, reverse revolution 60rpm / dispersion 3.9m / s; stirring 30-60min, stirring every 15min Monitor the appearance of the slurry, if there is a state of loose sand, stop stirring in time and move to the next step;

[0048] The third step: continue to add NMP to make the solid content 65%, forward revolution 80rpm / dispersion 6.5m / s; stir for 60-90min; after the stirring is completed, scrape off the mass slurry attached to the stirring blade;

[0049] The fourth step: continue to add NMP, dilute the slurry, adjust the viscosity to make it suitable for the coating process, so that the solid content is 55%...

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Abstract

The invention provides a preparation method of cathode paste for a lithium ion battery. The paste is prepared by adopting a dry mixing pasting process; a new dry mixing process route is applied on thepremise of reducing equipment and time investment, so that problems of paste agglomeration while the paste is stirred and paste deposition at high viscosity stage are avoided and a solid phase is uniformly and stably dispersed in a solvent; in addition, the preparation of a pot of paste can be completed in the best time on the premise of ensuring the optimum performance of the paste.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a method for preparing lithium ion battery anode slurry. Background technique [0002] With the development of science and technology and the advancement of lithium-ion battery preparation technology, the preparation process of lithium-ion batteries has become more and more mature, and the improvement of details and quality becomes more and more important. The homogenization of lithium-ion batteries is a key link in the production of lithium-ion batteries. The homogenization process is mainly to mix the active materials, binders and conductive agents into a uniform suspension. The key to the homogenization is how to mix the slurry into the slurry. The various components of the product are uniformly dispersed. In order to achieve this goal, the homogenization process needs to be optimized. In the positive and negative electrode slurry, the dispersion and unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 周海峰娄忠良
Owner 桑顿新能源科技(长沙)有限公司